Walk with swagger (6)
'walk with swagger' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for strut that I've seen before include "Support - pompous walk" , "Brace - affected gait" , "supporter" , "Strengthening bar" , "Display arrogance" .)
(Other definitions for sashay that I've seen before include "move smoothly" , "parade" , "Glide along" , "Walk showily" , "Walk glidingly" .)